Perhaps you should try some spelling variations:
multiling » multilingue, multilingues
multilinguismo » multilingueuismo, multilinguesuismo, multilingualism
{uml}sismo." » {uml}mismo.", {uml}simo."
{uml}sismos." » {uml}mismos.", {uml}simos."
{uml}sistmo." » {uml}istmo."
{uml}sisto." » {uml}visto.", {uml}sixto.", {uml}sist."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: "(multiling OR multilinguismo)({uml}sismo." or (({uml}sistmo." OR {uml}sisto.") or {uml}sismos."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(multiling OR multilinguismo)({uml}sismo.\" or (({uml}sistmo.\" OR {uml}sisto.\") or {uml}sismos.\"))".
• Removing quotes may allow a broader search: (multiling OR multilinguismo)({uml}sismo. or (({uml}sistmo. OR {uml}sisto. ) or {uml}sismos. )).
• Adding a wildcard symbol may retrieve word variants: "(multiling OR multilinguismo)({uml}sismo." or (({uml}sistmo." OR {uml}sisto.") or {uml}sismos."))*.